graph G {
graph [hostidtype="hostname", version="1:0", date="04/12/2013"];
edge [dir=none, notify="log"];
sw1:swp1 -- h1:swp1;
sw1:swp2 -- h2:swp1;
sw1:swp3 -- h3:swp1;
sw1:swp4 -- h4:swp1;
}